Hi Dmitry , I set I_MPI_DAPL_TRANSLATION_CACHE_MAX_ENTRY_NUM=2000 env variable but it still giving the same error . On each node 64GB memory is present . I also sarch for I_MPI_DAPL_TRANSLATION_CACHE_MAX_ENTRY_NUM variable but i did not get in intel mpi reference manual . Can you tell me where you get this variable reference.